tree 27ebe54b5fbc4083760df21ddd65d6d3ecc17dbd
parent d51cfc53ade3189455a1b88ec7a2ff0c24597cf8
author Christoph Hellwig <hch@lst.de> 1588596476 +0200
committer Jens Axboe <axboe@kernel.dk> 1589062077 -0600

bdi: add a ->dev_name field to struct backing_dev_info

Cache a copy of the name for the life time of the backing_dev_info
structure so that we can reference it even after unregistering.

Fixes: 68f23b89067f ("memcg: fix a crash in wb_workfn when a device disappears")
Reported-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>